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Electrolysis03:00

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Modulation of charge structure in Bi/Bi2O3-In2O3@C for efficient CO2 electroreduction to formate.

Zhongbao Feng1, Yumo Fu2, Ziyuan Yang3

  • 1Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China; Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking (Ministry of Education), Institute for Frontier Technologies of Low-Carbon Steelmaking, Shenyang 110819, Liaoning, China; Graduate School of Science and Technology, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan.

Journal of Colloid and Interface Science
|September 26, 2024
PubMed
Summary

A novel Bi/Bi2O3-In2O3@C electrocatalyst efficiently converts CO2 into valuable chemicals. This material achieves high formate production and stability, crucial for carbon neutrality goals.

Keywords:
Bi/Bi(2)O(3)-In(2)O(3)@CElectrochemical CO(2) reductionFormateHeterostructureMetal-organic framework

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalytic CO2 reduction reaction (ECO2RR) is vital for mitigating CO2 emissions and achieving carbon neutrality.
  • Developing efficient electrocatalysts is key to converting CO2 into value-added chemicals.

Purpose of the Study:

  • To fabricate and characterize a novel Bi/Bi2O3-In2O3@C electrocatalyst for ECO2RR.
  • To investigate the synergistic effects and catalytic mechanisms for enhanced performance.

Main Methods:

  • Facile solvothermal synthesis followed by calcination to create nanosheet array electrocatalysts.
  • Electrochemical testing to evaluate faradaic efficiency and stability.
  • In-situ Raman and ATR-FTIR spectroscopy combined with theoretical calculations for mechanistic studies.

Main Results:

  • The Bi/Bi2O3-In2O3@C electrocatalyst demonstrated excellent catalytic activity, achieving a maximum HCOOH faradaic efficiency (FEHCOOH) of 97.6% at -1.1 V vs. RHE.
  • High FEHCOOH (>90%) was maintained over a wide potential range (-0.8 to -1.4 V vs. RHE).
  • The catalyst exhibited remarkable stability, retaining 90.1% efficiency over a 60-hour test, attributed to synergistic effects and electronic structure modulation.

Conclusions:

  • The synergistic effects between Bi and In in the Bi/Bi2O3-In2O3@C electrocatalyst significantly enhance catalytic activity and stability for ECO2RR.
  • The catalyst's electronic structure modulation, including d-band center regulation and improved density of states, effectively moderates intermediate free energies, leading to superior formate production.
  • This work provides a promising pathway for developing efficient electrocatalysts for CO2 valorization and carbon neutrality.